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If 0 lt x lt pi/2 and sin^(n) x + cos^(...

If `0 lt x lt pi/2` and `sin^(n) x + cos^(n) x ge 1`, then

A

[1, 2]

B

[3, 4]

C

`[-oo,2]`

D

[-1, 1]

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A, C, D
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